Log Message:
The patch-ab assumes that on NetBSD, every <iconv.h> has the non-const
prototype argument for the second parameter of iconv(). This is true for
all but some release candidates of NetBSD-2.0, because either the
package converters/libiconv is used or there's a current <iconv.h>.
Needed for NetBSD-1.6.2. Approved by wiz.